Reciprocating power-driven saw



P 1952 F. GAVIOLA ET AL 2,609,015

RECIPROCATING POWER-DRIVEN SAW Filed April 22, 1947 3 Sheets-Sheei. l

INVENT OR.

Se t. 2, 1952 F. GAVIOLA ET AL 2,609,015

RECIPROCATING POWER-DRIVEN SAW Filed April 22, 1947 5 Sheets-Sheet 2 Sept. 2, 1952 GAVlOLA ET AL 2,609,015.

RECIPROCATING POWER-DRIVEN SAW Filed April 22. 1947 3 Sheets$heei 5 cal movement .for

a's inli'ig ure l. I Figured is a planlview shown in Figures-1 and 3.

Patented Sept. 2, 1952 oFFicE '7 RECIPROCATING POWER-DRIVEN. sA Frank 'Ga'viola and Frank Anacabe,Elko Nev. Application April 22, 1947', Serial bio/143,042

Our invention relates to improvements in power .operated saws and supplements the patent filed under Serial No. 666,967,. in-theUnited States Patent Office,lnow Patent No. 2,498,160.

An'iobject ofthe invention isjtoimprove the cuttingmethodby; providing a rolling motion to 'the sawblade by means ofilifting the end of the blade in its return strokeand lowering it in the cutting strokex- This effect is accomplished by attaching the saw blade directly. tothe lever or by inclining thea'xis'of the saw bladesupporting rod along the vertical plane; The, lever and the blade supporting rods are claimed in the previouspatent.

A further object is to provide a simple, light and inexpensive means forlconverting the rotary movement of. a motor or'flrexibleshaft to reciprooperating the blade of the hacksaw. l

A still further object is; to -provide means to hold an object that is being. cut in one place in relation to the saw blade, and to transfer the friction of the blade on the material being cut on to the hacks'aw frameeither directly or indirectly. :In other. words, .toxprovide. a self-containedstructural unit whencuttingi With the-foregoing and. other objects in view which willappear as the description proceeds, it being noted that changes in theprecise embodiment of-the invention'herein describedmay be made within thesco'pe of what. is claimed without departing 'fromthespirit of the invention. "The i invention consists in the'constru'etion, combina- 'tion," and arrangement .ofthe parts herein described and claimed and illustrated in the accompanying drawings. whereinz. w l 4 These objects we a'ccomplishwiththe device illustrated in the accompanying. drawings in which similar numerals and'lettersof reference indicate like parts throughout the several views and as described in the specification forming a part of this application and-pointed out in the appended claims.

In the drawings; Figure l is a side elevation of the device, parts cutaway and. shown in section to illustrate parts not seenfrom outside.

' Figure 2 is a plan view of Figure 1..

Figure 3 is a sideelevation ofa modified method of driving the saw, parts also cut away for clarity of Figure 3 7 -Claims. (cilia-6s) forward end of the framework for supporting the device showing the walking beam lever to which the forward e'ndof the saw "is attached by a removablesaw blade pm, which may be removed by extreme forward movement of the saw' to such a position that the end of the beam lever will be beyond the framework.

i'Figu're. 9'is a side elevation of a modified type of camrace which maybe used to drive the cam lever.

Figure it) is a further .modificationiof a cam movement'which might be utilized to operate the camlever. V

Figure. 11 is an edge view of Figure 10'. c

Figure 12 is a furthermodification of a cam movement for operating "the cam levenshowing a'double bearing type of cam...

Figure. 13 is a view showing a. single bearing "type of cam..

Figure 14 is an endview of'Figure'l3. r V

In the drawings which we have illustrated our invention and several modifications thereof we have .shown the. handle for operating and carrying the device as 5, onthe top end of which an electrical'fswitch' 6 is mounted. A cable 1 extends from the switch to. a 'motor lvi for operatingthe device. and the motor M is'mounted at any distance from the device and drives the cam for operating the saw blades by afiexible .cable The .cam 9 is mounted in between v ertical side or guard plates ll of the framework A for the devicean'd. the cam is provided with suitablebearingsfi for holding it in true position in-the framework A l A cam operated lever I2 hereafterdesignated as the cam lever pivotally supported at the'top end by a from the device and shown attached directly to 4 the saw blade without the sliding' guide arm f Figure {I is a section of cam "lever sectionedto show the meansforattach- 'the lower end of the pin 19 inserted in and carried between the guard plates H. The camv 9 jisan eccentric-body car- 'ricd'in an oval opening I4 in the cam lever l2 so that rotation of thecam will cause the: pivoted lever to oscillate forwardly and backwardly between the side plates or guard plates H. v The bottom end of the guardplates ll carryfa-guide base 15 therebetween whichlguide base is formed as a cylindrical guide tubeorbearing with .a slot through the .top thereof .in' which the upwardly extended slotted lug lfi-ofthe saw operating rod ll isoperatedi". v l r I The rod ll operates forwardly and backwardly in the guide base l5 and is' driven bythe cam lever ['2 whichfisfconnected therewith by the pin i l8 passing throughjfthe end of the lever. and

through the slot in the lug. [6,,the slot allowing for the straightline movement-of the rod H, but connecting the cam lever to the saw to provide the forward and backward movement of the saw blade S. The saw blade Sis attached to the rod H by inserting it in'a slot in the end of I the rod' H and attaching it thereto by a' pin [9a. 1 Extending forward fromthe plates ll there is 3 a frame 22 which frame is made U-shaped with one leg 23 attached to and between the plates II by a rivet-or other suitable'means. The other leg 25 of the frame 22 is turned down at the forward end and plates 26 are attached to each side thereof in a manner similar to the means for attaching the plates II to the leg 23. A walking beam lever arm 21 is mounted between the two plates by a fulcrum pin 28. The lower end of the walking beam 21 is bifurcated to receive the forward end of the saw blade S and a pin 36 is passed through the end of the lever and the perforate end'of the saw to hold the saw in suspended position 'on the end of the lever. The 'pinlis held in place by the two plates 26 and may be removed by moving the saw forward washers are providedon" each side of the walking beam '21 on the fulcrum pin 28 to take up the friction of the pivotal point of the walking beam. A slotted guide 2'5 is provided 'at the lower end of the frame A to stabilize and clean the saw blade S. V

On'the top" of the fram'e22 a cylinder 3| is mounted, said cylinder carrying a piston 32 on the end of the rod 33. A bifurcated link 34 connects the forward end of the rod 33 with the top en'd of. the walking beam 21 by pins 35 and 36. 'A spring 3! is carried within the cylinder between the piston '32 and a bushing nut 38. The nut 38 is externally threaded to screw into the end of the cylinder 3| to provide for adjusting the tension of the spring 31. The link 34 converts rectilinear movement of the rod 33 to curvilinear movement of the walking beam 21,

whereby the spring tension of the spring 32 is transmitted to the saw blade S normally biasing said blade to downward and backward position.

ment of the saw blade raises it from'the work.

Attached to the plates I we provide forwardly extended guide plates 46 which plates have their forward ends extended at right angles to support a slidable face plate 4|. The face plate is attached to the plates 46 by adjustment bolts 42. .An adjustable clamp 43 is carried on the end of a support rod 44 which rod is secured to the face plate 4|. The clamp 43 is adjustable on the rod by a wing nut 45. A restraining member 46 is attached pivotally to the leg by the pin or adjusting bolt 41. The lower surface of the member 46 is formed with downwardly extended teeth 46, or other suitable sharpened points which are adapted to engage the workbeing cut and hold it in alignment with the saw blade S. A spacer 49 is placed between the two plates 20 at the lower corner thereof to hold them in spaced relationship and prevent their binding the lower end of the walking beam. I

In Figure 3Lof the drawings, I have shown a modified means for operating the saw which consists of an inverted V-shaped cam lever 5|, which lever is pivoted to the leg 2| of the U-shaped frame 22' of the framework A by a pin 52. The leg 53 of the lever 5| is provided with a cam pin 54 which pin engages in a cam race 55 in the cam 56. The cam 56 is mounted on and rotated by a shaft 5'|,which in turn is driven by any suitable source of power, such as the flexible shaft shown in Figures 1 and 2. A casing 58 encloses the cam in the rear end of the lever 5|.

4 The leg 59 of the lever 5| is extended down to and engaged with the operating rod 60 by the pin 6| in the slot 62 of the up-turned boss 63 which is attached to or formed as an integral part of the rod 60. A guide cylinder 64 is attached to the bottom end of the leg 2| at a slight angle so that the rod 60 is inclined upwardly on the end to which the saw blade S is attached.

The rest of the device is substantially identical to that shown in Figures 1 and 2.

In Figure 6 of the drawings, the lever 5| is shown attached directly to the saw blade S and it will be obvious that the cam lever l2 may also be attached directly to the saw blade if so desired. I

Figures illustrates the method of constructing a cam 56, showing the race 55 cut therein.

Figures 10 and 11 show another modification of a cam which may be employed for the same purpose asthe cam 56 and which consists of a cam plate 65in which a race 66 is formed, in which race the cam pin 54 may operate. The boss 61 extended from the back side of the plate 65 is provided as a bearing support for the cam plate and also as a means of attaching the flexible cable 8 thereto.

In Figure 12 'I have shown a crank shaft 68 carrying an eccentric roller 69 thereon and which crank and roller may be substituted 'for'the eccentric 0r cam 9 of :Figure 1.

Figure 13 illustrates a half crank 70 carrying a cam roller 1| thereon which may also be utilized for the same purpose as that of the earn 9.

A slidable holding plate 13 is carried in a bracket 14 on the side of the plate H. The forward end 15 of the plate is adapted to be engaged against the work being cut to hold it from slipping and to guide the work in relation to the saw. Indentations or catch holes 16 are formed in the outside surface of the plate 13 and a pin 11 is provided in the plate H with the end of the pin adapted to engage in any of the holes I6 desired. A retaining spring 18 normally holds the pin 1! in position in one of the holes 16.

Reaction springs 19 and 19' may be employed by the lever l2 and the frame and between the lever 53 andits respective frame to assist the driving mechanism of the saw for balancing the tension spring 31 on the non-cutting stroke of the saw blades S ands. Springs 19 and 19 assist the driving mechanism of the saw on the cutting stroke and balance the tension spring 31 on the non-cutting stroke of the saw blades S and S. 7

As shown in Figure 6, it is obvious that levers l2 or 5| maybe extended upward as shown at 5| like lever 21 and connected to a turnbuckle 86 and then to a tension spring or to the spring 31 in a similar manner. By this arrangement a continuously even tension will be maintained at each end of the saw blades Sand S. Tension adjustment may be provided by turnbuckle 80.

The operation of the device is as follows:

The cam 9 is rotated by any electric motor or other source of power such as the flexible shaft 8 and the contour and eccentricity-o1 the cam converts the rotational force and power to a variable rectilinear reciprocal movement ofzthe saw blade. The lever 21 to which'the'saw blade S is attached lifts or lowers the adjacent end of the saw blade and thereby assures an efiicient cutting stroke. The tension spring 31 and its component parts cooperating therewith provide the minimum of obstruction and the highest efficiency. The mechanical reciprocation of the blade enables the user to cut wood, metals, meats, or materials with little expenditure of energy.

While the above described structure is what we at the present time consider to be the best solution and embodiment of our invention, we wish it understood that the construction is merely illustrative and any minor changes of detail in fabrication may be resorted to without departing from the spirit of the invention or the scope of the appended claims.

Having thus described our invention, we claim:

1. In a power driven saw, in combination, a U-shaped frame including a pair of side plates, a lever pivotally mounted at one end of said frame, a second lever having a separate pivotal mounting at the other end of said frame, a saw blade connected at one end directly to said first lever, a rod connecting the other end of said saw blade to said second lever, said saw blade extending across the open side of said frame, a rotatable power driven cam means secured between said side plates, said first mentioned lever having an aperture therein coacting with said cam to provide a reciprocatory motion to said one end of said blade, and said second lever imparting a rocking motion to said other end of said blade.

2. In a power driven saw, in combination, a U-shaped frame including a pair of side plates, a lever pivotally mounted at one end of said frame, a second lever having a separate pivotal mounting at the other end of said frame, a saw blade connected at one end directly to said first lever, a rod connecting the other end of said saw blade to said second lever, said saw blade extending across the open side of said frame, a rotatable power driven cam means secured between said side plates, said first mentioned lever having an aperture therein coacting with said cam to provide a reciprocatory motion to said one end of said blade, and spring means carried by said frame normally biasing said second lever to move said blade to upward and backward position.

3. In a power driven saw, in combination, a U-shaped frame including a pair of side plates, a lever pivotally mounted at one end of said frame, a second lever having a separate pivotal mounting at the other end of said frame, a saw blade connected at one end directly to said first lever, a rod connecting the other end of said saw blade to said second lever, said saw blade extending across the open side of said frame, a rotatable power driven cam means secured between said side plates, said first mentioned lever having an aperture therein coacting with said cam to provide a reciprocatory motion to said one end of said blade, and spring means carried by said frame normally biasing said second lever to move said blade to upward and backward position, said means including a piston secured to the end of said second lever opposite said blade and carried by said frame containing said piston, said spring bearing against said piston to bias the same inwardly of said cylinder.

FRANK GAVIOLA. FRANK ANACABE.

REFERENCES CITED 'The following references are of record in the file of this patent:

UNITED STATES PATENTS Brazeale Jan. 10, 1939 

